Comment: Well, yes this is a good analogy

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In reply to comment: Earth fartin' in the tub (see in situ)

Well, yes this is a good analogy

and the gas bubbles to the surface and into the air. I saw boys once letting farts and holding a match at the anus opening. Yes it does burn and make a flame. And yes one of them was my son. Yipes! Put a stop to that fast.